| http://www.w3.org/ns/prov#value | - m is a naturally occurring element that contaminates water due to mining or petrolum refining, fly-ash from coal-burning power plants, and irrigation of arid farmland soils high in selenium.5.43 ppb31 ppbNo50 ppbNo50 ppbBarium (total)Barium is a mineral that enters drinking water through drilling and mining waste runoff, discharges from chemical industries and erosion of natural deposits.5.92 ppb3
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